AAR bets big on MRO, but cash flow doubts linger

AAR’s integration logic depends on an aftermarket cycle that is being extended by fleet scarcity: GE Aerospace said it has “Over a thousand engines with Indigo Airlines in India… multi year commitment” and that “We’re sold out into the early 2030s,” while supply-chain investments are only gradually lifting output. That helps explain why AAR’s mix is shifting toward a supply chain and software platform that also runs hangars, with Empor.top noting its addressable parts and repair market is expected to grow from roughly $80 billion toward $90 billion by 2029.

The real earnings opportunity comes from airlines keeping older aircraft flying longer and buying deeper work scopes, not simply from retirement counts. Sash argued that “the key… is not… whether they’re retiring aircraft or not, it’s what price they’re paying to keep the older aircraft going and how optimistic they are about… that aircraft on a five to seven year scale,” and described overhaul choices down to “How many percent… light do you want us… to replace every part that might need replacing in the next four or five years?”—work that “fixes the MRO guys profitability,” especially when Airbus “had suspended A330neo production… [then] production has resumed.”

The structure of the transaction shows AAR is not making a tentative bet on maintenance but re-entering the segment with operating control and a defined perimeter. PR Newswire framed the move in blunt terms — “AAR’s CEO John Holmes Seals $1.8 B Deal for 65% of Bain-Backed MRO Holdings” — and that 65% stake matters because it gives AAR a controlling position in an established heavy-maintenance operator rather than a passive financial interest, making the acquisition a controlled re-entry into a business it can direct and integrate.

AAR itself cast the acquisition as an extension of a broader platform, saying, “Along with our strong fiscal first quarter earnings, we also announced an agreement to acquire a 65% controlling interest in MRO Holdings.” The company added, “Over the last several years, AAR has taken important steps to reshape our portfolio into an integrated Parts, Repair, and Software aviation aftermarket platform,” and said the MRO Holdings deal gives it scale that “significantly accelerates our strategy” because heavy maintenance “helps drive revenue to all other areas of the company.”

The core investor debate is not whether AAR can grow revenue, but whether that growth will reliably turn into cash. Empor.top notes AAR generated operating cash flow of $23.3 million in fiscal 2023, $43.6 million in 2024, $36.1 million in 2025, and $98.7 million in 2026, versus $401.1 million in reported adjusted EBITDA; as its due-diligence analysis put it, “generating $98.7 million in operating cash flow from $401.1 million in adjusted EBITDA raises questions regarding whether adjusted earnings serve as an appropriate valuation metric,” especially when management’s goal of converting “30% or more of adjusted EBITDA into operating cash flow over three years” itself concedes heavy working-capital demands.

That skepticism deepens because execution risk now sits on top of already-thin margin confidence. Empor.top wrote that “Executing six transactions across three years with four still in early integration stages introduces operational complexity, particularly alongside a chief financial officer transition,” while heavy airframe maintenance “depends strictly on the number of certificated technicians working in hangars” amid an “estimated annual industry shortage of 12,000 to 18,000 technicians”; even portfolio cleanup may only partially help, since exiting Legacy Commercial Programs would “liberate approximately $160 million in net assets” but only modestly improve returns against a multibillion-dollar capital base, despite bulls arguing the mix shift could lift blended margins toward a 13% to 14% target range.